This position still gives Stockfish a difficult time on my computer (20 core dual xeon with 16GB hash), also Houdini 5.01 tactical doesn't seem to do much better, neither one solves in 10 minutes.
[d]r2r1q1k/5p1p/4pP2/pppbB2Q/1b6/1P4P1/5PBP/R2R2K1 w - - 0 24
both engines seem to like 24.Bc7, but the best move is the exchange sacrifice 24.Rxd5! busting up black's position and wreaking havoc with threats to the black king with the white bishops and white queen.
New game
r2r1q1k/5p1p/4pP2/pppbB2Q/1b6/1P4P1/5PBP/R2R2K1 w - - 0 1
Analysis by Stockfish 190817 64 BMI2:
+/- (0.72 ++) Depth: 43/69 00:03:46 6896MN
24.Bc7 Rd7 25.Bf4 Qg8 26.Bxd5 exd5 27.Rxd5 Rxd5 28.Qxd5 Rd8 29.Qf3 c4 30.bxc4 bxc4 31.h4 Qg6 32.Bc7 Rc8 33.Bxa5 Bxa5 34.Rxa5 c3 35.h5 Qg8 36.Qf4 c2 37.Ra1 Qf8 38.Rc1 Qc5 39.Qh6 Rg8 40.Kg2 Qc4 41.Qd2 Rc8 42.f3 Qc7 43.g4 Qc5 44.Qh6 Rg8 45.Kg3 Qd6+ 46.Kh3 Qd3 47.Qf4 Qd1 48.Kh2 Rd8 49.Kg2 Rc8 50.Kg3 Ra8 51.Qh6 Rg8 52.Qe3 Rd8 53.Kg2 Rc8
+/- (0.80) Depth: 43/75 00:04:19 7966MN
24.Bc7 Rd7 25.Bf4 Qg8 26.Bxd5 exd5 27.Rxd5 Rxd5 28.Qxd5 Rd8 29.Qf3 c4 30.bxc4 bxc4 31.h4 Qg6 32.Bc7 Rc8 33.Bxa5 Bxa5 34.Rxa5 c3 35.h5 Qg8 36.Qf4 c2 37.Ra1 Qf8 38.Rc1 Qc5 39.Qh6 Rg8 40.Kg2 Qd4 41.f3 Qc5 42.g4 Qc6 43.Kg3 Qc5 44.Qd2 Rc8 45.Kg2 Qc6 46.Qf4 Qd5 47.Qe3 Rg8 48.Kg3 Qd6+ 49.Kh3 Qd1 50.Qf4 Rc8 51.Kh2 Qe2+ 52.Kg3 Qd1 53.Qg5 Rg8 54.Qh6 Qd6+ 55.Qf4 Qc5 56.Kg2 Qc3 57.Qh6
+/- (0.80) Depth: 44/67 00:04:26 8197MN
24.Bc7 Rd7 25.Bf4 Qg8 26.Bxd5 exd5 27.Rxd5 Rxd5 28.Qxd5 Rd8 29.Qf3 c4 30.bxc4 bxc4 31.h4 Qg6 32.Bc7 Rc8 33.Bxa5 Bxa5 34.Rxa5 c3 35.h5 Qg8 36.Qf4 c2 37.Ra1 Qf8 38.Rc1 Qc5 39.Qh6 Rg8 40.Kg2 Qd4 41.f3 Qc5 42.g4 Qc6 43.Kg3 Qc5 44.Qd2 Rc8 45.Kg2 Qc6 46.Qf4 Rg8 47.Kf2 Qc5+ 48.Qe3 Qc6 49.Kg3 Qd6+ 50.Qf4 Qc5 51.Qe4 Rc8 52.Qe7 Qc4 53.Qe3 Qc7+ 54.Kg2 Qc4 55.Qg5 Rg8 56.Qd2 Rc8 57.Qe3 Qd5 58.Qf4
+/- (0.80) Depth: 45/70 00:05:05 9481MN
24.Bc7 Rd7 25.Bf4 Qg8 26.Bxd5 exd5 27.Rxd5 Rxd5 28.Qxd5 Rd8 29.Qf3 c4 30.bxc4 bxc4 31.h4 Qg6 32.Bc7 Rc8 33.Bxa5 Bxa5 34.Rxa5 c3 35.h5 Qg8 36.Qe3 Qf8 37.Kg2 c2 38.Ra1 Qd6 39.Qh6 Rg8 40.Re1 Qd8 41.f3 Qc7 42.g4 Qc6 43.Qf4 Rc8 44.Rc1 Qc3 45.Kg3 Qc5 46.Qd2 Qc7+ 47.Kh3 Qc3 48.Qf4 Rg8 49.Kg3 Qc5 50.Qe4 Rc8 51.Qe7 Qc4 52.Qe3 Qc7+ 53.Kg2 Qc4 54.Qh6 Rg8 55.Kf2 Qc3 56.Qe3 Qc4 57.Kg3 Qc7+ 58.Kh3 Qc4
+/- (0.80) Depth: 46/70 00:05:14 9782MN
24.Bc7 Rd7 25.Bf4 Qg8 26.Bxd5 exd5 27.Rxd5 Rxd5 28.Qxd5 Rd8 29.Qf3 c4 30.bxc4 bxc4 31.h4 Qg6 32.Bc7 Rc8 33.Bxa5 Bxa5 34.Rxa5 c3 35.h5 Qg8 36.Qe3 Qf8 37.Kg2 c2 38.Ra1 Qd6 39.Qh6 Rg8 40.Re1 Qd8 41.f3 Qc7 42.g4 Qc6 43.Qf4 Rc8 44.Rc1 Qc3 45.Kg3 Qc5 46.Qd2 Qc7+ 47.Kh3 Qc3 48.Qf4 Rg8 49.Kg3 Qc5 50.Qe4 Rc8 51.Qe7 Qc4 52.Qe3 Qc7+ 53.Kg2 Qc4 54.Qh6 Rg8 55.Kf2 Qc3 56.Qe3 Qc4 57.Kg3 Qc7+ 58.Kh3 Qc4 59.Qh6 Qc6
+/- (0.80) Depth: 47/73 00:05:40 10603MN
24.Bc7 Rd7
+/- (0.72 --) Depth: 48/62 00:06:49 12813MN
24.Bc7 Rd7
+/= (0.65 --) Depth: 48/62 00:08:25 15919MN
24.Bc7 Rd7
+/= (0.54 --) Depth: 48/62 00:10:47 20518MN
Old position I posted a while back
Moderators: hgm, Rebel, chrisw
-
acase
- Posts: 981
- Joined: Wed Mar 15, 2006 1:14 am
- Location: Columbus, Ohio USA
- Full name: Andrew R Case
-
Lyudmil Tsvetkov
- Posts: 6052
- Joined: Tue Jun 12, 2012 12:41 pm
Re: Old position I posted a while back
I would go for Bf4, maybe there are even subtler moves:
[d]r2r1q1k/5p1p/4pP2/pppb3Q/1b3B2/1P4P1/5PBP/R2R2K1 b - - 0 1
is it certain that Rd5 is best?
[d]r2r1q1k/5p1p/4pP2/pppb3Q/1b3B2/1P4P1/5PBP/R2R2K1 b - - 0 1
is it certain that Rd5 is best?
-
Eelco de Groot
- Posts: 4561
- Joined: Sun Mar 12, 2006 2:40 am
- Full name:
Re: Old position I posted a while back
Thanks Andrew, this does not seem very difficult for almost default Stockfish development version:
r2r1q1k/5p1p/4pP2/pppbB2Q/1b6/1P4P1/5PBP/R2R2K1 w - -
Engine: Test Imbalance HT (i7 6700, 4+3 threads, 512 MB)
Latest changes: Very small change to passed pawns and SkipEarlyPruning only. I forgot. To quote Wasily Smyslow (Vasily Smyslov?) when playing an elementary Rook endgame against the Fidelity Elite: I wrrote a book about this. But I forgot what I wrrote!
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
24/47 0:02 +0.90 1.Bf4 Qg8 2.Bxd5 exd5 3.Rxd5 Rxd5
4.Qxd5 Rd8 5.Qf3 Qg6 6.Bc7 Qd3 7.Qh5 Rg8
8.Qxf7 Bc3 9.Rc1 Bd4 10.Qh5 Qg6
11.Qxg6 Rxg6 12.Bd6 Bxf6 13.Bxc5 Rg8
14.Kg2 (30.477.247) 10904
.
.
.
31/55 0:22 +0.62 1.Bxd5 exd5 2.Bc7 Rd7 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Ra2 Qg6 9.Re2 c3
10.Kg2 h6 11.Re4 c2 12.Rc4 Kh7
13.Qe2 Qd3 14.Qxc2 (246.687.289) 10861
32/53 0:26 +0.69 1.Bxd5 exd5 2.Bc7 Rd7 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Ra2 Qg6 9.Re2 c3
10.Kg2 h6 11.Bc7 Rf8 12.Qc6 Kh7
13.Be5 Qg4 14.Re4 (282.714.381) 10856
33/48 0:30 +0.61-- 1.Bxd5 exd5 (330.951.870) 10781
33/48 0:35 +0.65 1.Bxd5 exd5 2.Bc7 Rd7 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Ra2 Qg6 9.Re2 c3
10.Kg2 h6 11.Re4 c2 12.Rc4 Kh7
13.Qe2 Qd3 14.Qxc2 (378.209.458) 10732
34/52 0:43 +0.58 1.Bc7 Rd7 2.Bxd5 exd5 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Ra2 Qg6 9.Re2 c3
10.Re4 c2 11.Rc4 h6 12.Qe2 Kh7
13.Kg2 Qd3 14.Qxc2 (465.456.787) 10635
35/54 0:48 +0.66++ 1.Bc7 (513.351.844) 10629
35/62 0:52 +0.64 1.Bc7 Rd7 2.Bxd5 exd5 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Kg2 Qe8 9.Ra2 Qd7
10.Re2 Bf8 11.Rd2 Qc8 12.Rxd8 Qxd8
13.Qc6 Kg8 14.Qxc4 (559.163.953) 10604
36/49 1:12 +0.71++ 1.Bc7 (766.533.756) 10613
36/59 1:27 +0.67 1.Bc7 Rd7 2.Be4 Qg8 3.Bxd5 Rxd5
4.Rxd5 exd5 5.Qxd5 a4 6.bxa4 bxa4
7.Bd6 Bc3 8.Ra2 Bxf6 9.Bxc5 Bg7
10.Qd7 Qc8 11.Qxc8+ Rxc8 12.Rxa4 Rxc5
13.Ra8+ Bf8 14.Rxf8+ (931.513.201) 10616
37/57 1:44 +0.69 1.Bc7 Rd7 2.Be4 Qg8 3.Bxd5 Rxd5
4.Rxd5 exd5 5.Qxd5 a4 6.bxa4 bxa4
7.Bd6 Bc3 8.Ra2 Bxf6 9.Bxc5 Bg7
10.Qd7 Qc8 11.Qxc8+ Rxc8 12.Rxa4 Rxc5
13.Ra8+ Bf8 14.Rxf8+ (1.113.773.689) 10609
38/57 2:42 +0.77++ 1.Rxd5 (1.706.663.978) 10498
38/57 2:52 +0.84++ 1.Rxd5 (1.804.017.585) 10470
38/57 3:07 +0.95++ 1.Rxd5 (1.956.943.623) 10446
38/62 3:41 +1.11++ 1.Rxd5 (2.312.737.029) 10446
38/62 4:10 +1.33++ 1.Rxd5 (2.614.845.922) 10433
38/62 4:52 +1.08 1.Rxd5 exd5 2.Rd1 a4 3.bxa4 bxa4
4.Bxd5 Qe8 5.Bxa8 Rxa8 6.Qg4 Qg8
7.Qc4 Re8 8.Bf4 Qg6 9.Qb5 Rg8
10.Qxa4 Bc3 11.Be3 Bxf6 12.Rd5 Qg4
13.Qxg4 Rxg4 14.Rxc5 (3.053.911.842) 10429
39/26 5:06 +1.16++ 1.Rxd5 (3.199.844.908) 10444
39/26 5:09 +1.23++ 1.Rxd5 (3.232.620.780) 10445
39/41 5:14 +1.35++ 1.Rxd5 (3.283.955.188) 10448
39/49 5:18 +1.50++ 1.Rxd5 (3.333.442.989) 10452
39/49 6:00 +1.72++ 1.Rxd5 (3.784.224.226) 10490
39/63 7:32 +2.01++ 1.Rxd5 (4.759.114.358) 10517
39/64 7:54 +1.92 1.Rxd5 exd5 2.Rd1 Qe8 3.Rxd5 Qg8
4.Bd6 Qg6 5.Qe2 Qb1+ 6.Rd1 Qg6 7.Be4 Qg8
8.Rd5 Bc3 9.Qe3 Bxf6 10.Qf4 Bg7
11.Rh5 Rxd6 12.Qxd6 Qf8 13.Qd7 Ra6
14.Qxb5 (4.987.891.671) 10520
40/64 8:23 +2.00++ 1.Rxd5 (5.294.279.220) 10521
40/64 9:23 +2.07++ 1.Rxd5 (5.923.399.976) 10514
40/83 10:27 +2.07 1.Rxd5 exd5 2.Rd1 Qg8 3.Bxd5 Rd7
4.Bxa8 Rxd1+ 5.Qxd1 Qxa8 6.Qd7 Qg8
7.Qxb5 h6 8.Qc4 Qg6 9.Kg2 Kg8 10.Qf4 Qg5
11.Qe4 Qg6 12.Qa8+ Kh7 13.Qf3 Kg8
14.h4 (6.610.482.139) 10536
41/68 10:56 +2.00-- 1.Rxd5 exd5 (6.919.176.129) 10541
41/68 11:03 +2.07++ 1.Rxd5 (6.997.083.014) 10543
41/68 11:44 +2.17 1.Rxd5 exd5 2.Rd1 Qe8 3.Rxd5 Qg8
4.Bd6 Qg6 5.Qe2 Qb1+ 6.Rd1 Qg6 7.Be4 Qg8
8.Bxa8 Rxa8 9.Qxb5 Bc3 10.Qxc5 Bxf6
11.Be5 Bxe5 12.Qxe5+ Qg7 13.Qe4 Rf8
14.Rd5 (7.433.086.588) 10557
42/61 11:46 +2.10-- 1.Rxd5 exd5 (7.458.404.071) 10558
42/61 11:48 +2.02-- 1.Rxd5 exd5 (7.484.472.567) 10558
42/61 11:56 +1.99 1.Rxd5 exd5 2.Rd1 Qe8 3.Rxd5 Qg8
4.Bd6 Qg6 5.Qe2 Qb1+ 6.Rd1 Qg6 7.Be4 Qg8
8.Bxa8 Rxa8 9.Qxb5 Bc3 10.Qxc5 Bxf6
11.Be5 Bxe5 12.Qxe5+ Qg7 13.Qe4 Rf8
14.Rd5 (7.569.133.767) 10557
43/70 12:26 +2.07++ 1.Rxd5 (7.882.650.195) 10562
43/70 13:11 +2.14++ 1.Rxd5 (8.364.566.290) 10561
43/70 13:40 +1.92-- 1.Rxd5 exd5 (8.669.848.401) 10569
43/70 13:47 +2.08++ 1.Rxd5 (8.749.106.421) 10569
43/70 14:02 +2.04 1.Rxd5 exd5 2.Rd1 Qg8 3.Bxd5 Qg6
4.Bxa8 Rxa8 5.Qf3 Rg8 6.h4 c4 7.bxc4 bxc4
8.Rd7 h6 9.h5 Qb1+ 10.Kg2 Qh7 11.Rc7 Rd8
12.Qf4 c3 13.Qc4 Rf8 14.Bf4 (8.904.379.097) 10570
44/57 14:20 +2.11++ 1.Rxd5 (9.095.334.060) 10570
44/63 15:20 +2.17 1.Rxd5 exd5 2.Rd1 Qg8 3.Bxd5 Qg6
4.Bxa8 Rxa8 5.Qf3 Re8 6.h4 c4 7.bxc4 bxc4
8.Rd7 h6 9.h5 Qb1+ 10.Kg2 Qh7 11.Qd5 Rf8
12.Bf4 Kg8 13.Be3 c3 14.Rc7 (9.739.624.780) 10584
45/63 15:21 +2.17 1.Rxd5 exd5 2.Rd1 Qg8 3.Bxd5 Qg6
4.Bxa8 Rxa8 5.Qf3 Re8 6.h4 c4 7.bxc4 bxc4
8.Rd7 h6 9.h5 Qb1+ 10.Kg2 Qh7 11.Qd5 Rf8
12.Bf4 Kg8 13.Be3 c3 14.Rc7 (9.757.078.489) 10583
best move: Rd1xd5 time: 15:22.015 min n/s: 10.583.823 nodes: 9.757.078.489
r2r1q1k/5p1p/4pP2/pppbB2Q/1b6/1P4P1/5PBP/R2R2K1 w - -
Engine: Test Imbalance HT (i7 6700, 4+3 threads, 512 MB)
Latest changes: Very small change to passed pawns and SkipEarlyPruning only. I forgot. To quote Wasily Smyslow (Vasily Smyslov?) when playing an elementary Rook endgame against the Fidelity Elite: I wrrote a book about this. But I forgot what I wrrote!
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
24/47 0:02 +0.90 1.Bf4 Qg8 2.Bxd5 exd5 3.Rxd5 Rxd5
4.Qxd5 Rd8 5.Qf3 Qg6 6.Bc7 Qd3 7.Qh5 Rg8
8.Qxf7 Bc3 9.Rc1 Bd4 10.Qh5 Qg6
11.Qxg6 Rxg6 12.Bd6 Bxf6 13.Bxc5 Rg8
14.Kg2 (30.477.247) 10904
.
.
.
31/55 0:22 +0.62 1.Bxd5 exd5 2.Bc7 Rd7 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Ra2 Qg6 9.Re2 c3
10.Kg2 h6 11.Re4 c2 12.Rc4 Kh7
13.Qe2 Qd3 14.Qxc2 (246.687.289) 10861
32/53 0:26 +0.69 1.Bxd5 exd5 2.Bc7 Rd7 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Ra2 Qg6 9.Re2 c3
10.Kg2 h6 11.Bc7 Rf8 12.Qc6 Kh7
13.Be5 Qg4 14.Re4 (282.714.381) 10856
33/48 0:30 +0.61-- 1.Bxd5 exd5 (330.951.870) 10781
33/48 0:35 +0.65 1.Bxd5 exd5 2.Bc7 Rd7 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Ra2 Qg6 9.Re2 c3
10.Kg2 h6 11.Re4 c2 12.Rc4 Kh7
13.Qe2 Qd3 14.Qxc2 (378.209.458) 10732
34/52 0:43 +0.58 1.Bc7 Rd7 2.Bxd5 exd5 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Ra2 Qg6 9.Re2 c3
10.Re4 c2 11.Rc4 h6 12.Qe2 Kh7
13.Kg2 Qd3 14.Qxc2 (465.456.787) 10635
35/54 0:48 +0.66++ 1.Bc7 (513.351.844) 10629
35/62 0:52 +0.64 1.Bc7 Rd7 2.Bxd5 exd5 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Kg2 Qe8 9.Ra2 Qd7
10.Re2 Bf8 11.Rd2 Qc8 12.Rxd8 Qxd8
13.Qc6 Kg8 14.Qxc4 (559.163.953) 10604
36/49 1:12 +0.71++ 1.Bc7 (766.533.756) 10613
36/59 1:27 +0.67 1.Bc7 Rd7 2.Be4 Qg8 3.Bxd5 Rxd5
4.Rxd5 exd5 5.Qxd5 a4 6.bxa4 bxa4
7.Bd6 Bc3 8.Ra2 Bxf6 9.Bxc5 Bg7
10.Qd7 Qc8 11.Qxc8+ Rxc8 12.Rxa4 Rxc5
13.Ra8+ Bf8 14.Rxf8+ (931.513.201) 10616
37/57 1:44 +0.69 1.Bc7 Rd7 2.Be4 Qg8 3.Bxd5 Rxd5
4.Rxd5 exd5 5.Qxd5 a4 6.bxa4 bxa4
7.Bd6 Bc3 8.Ra2 Bxf6 9.Bxc5 Bg7
10.Qd7 Qc8 11.Qxc8+ Rxc8 12.Rxa4 Rxc5
13.Ra8+ Bf8 14.Rxf8+ (1.113.773.689) 10609
38/57 2:42 +0.77++ 1.Rxd5 (1.706.663.978) 10498
38/57 2:52 +0.84++ 1.Rxd5 (1.804.017.585) 10470
38/57 3:07 +0.95++ 1.Rxd5 (1.956.943.623) 10446
38/62 3:41 +1.11++ 1.Rxd5 (2.312.737.029) 10446
38/62 4:10 +1.33++ 1.Rxd5 (2.614.845.922) 10433
38/62 4:52 +1.08 1.Rxd5 exd5 2.Rd1 a4 3.bxa4 bxa4
4.Bxd5 Qe8 5.Bxa8 Rxa8 6.Qg4 Qg8
7.Qc4 Re8 8.Bf4 Qg6 9.Qb5 Rg8
10.Qxa4 Bc3 11.Be3 Bxf6 12.Rd5 Qg4
13.Qxg4 Rxg4 14.Rxc5 (3.053.911.842) 10429
39/26 5:06 +1.16++ 1.Rxd5 (3.199.844.908) 10444
39/26 5:09 +1.23++ 1.Rxd5 (3.232.620.780) 10445
39/41 5:14 +1.35++ 1.Rxd5 (3.283.955.188) 10448
39/49 5:18 +1.50++ 1.Rxd5 (3.333.442.989) 10452
39/49 6:00 +1.72++ 1.Rxd5 (3.784.224.226) 10490
39/63 7:32 +2.01++ 1.Rxd5 (4.759.114.358) 10517
39/64 7:54 +1.92 1.Rxd5 exd5 2.Rd1 Qe8 3.Rxd5 Qg8
4.Bd6 Qg6 5.Qe2 Qb1+ 6.Rd1 Qg6 7.Be4 Qg8
8.Rd5 Bc3 9.Qe3 Bxf6 10.Qf4 Bg7
11.Rh5 Rxd6 12.Qxd6 Qf8 13.Qd7 Ra6
14.Qxb5 (4.987.891.671) 10520
40/64 8:23 +2.00++ 1.Rxd5 (5.294.279.220) 10521
40/64 9:23 +2.07++ 1.Rxd5 (5.923.399.976) 10514
40/83 10:27 +2.07 1.Rxd5 exd5 2.Rd1 Qg8 3.Bxd5 Rd7
4.Bxa8 Rxd1+ 5.Qxd1 Qxa8 6.Qd7 Qg8
7.Qxb5 h6 8.Qc4 Qg6 9.Kg2 Kg8 10.Qf4 Qg5
11.Qe4 Qg6 12.Qa8+ Kh7 13.Qf3 Kg8
14.h4 (6.610.482.139) 10536
41/68 10:56 +2.00-- 1.Rxd5 exd5 (6.919.176.129) 10541
41/68 11:03 +2.07++ 1.Rxd5 (6.997.083.014) 10543
41/68 11:44 +2.17 1.Rxd5 exd5 2.Rd1 Qe8 3.Rxd5 Qg8
4.Bd6 Qg6 5.Qe2 Qb1+ 6.Rd1 Qg6 7.Be4 Qg8
8.Bxa8 Rxa8 9.Qxb5 Bc3 10.Qxc5 Bxf6
11.Be5 Bxe5 12.Qxe5+ Qg7 13.Qe4 Rf8
14.Rd5 (7.433.086.588) 10557
42/61 11:46 +2.10-- 1.Rxd5 exd5 (7.458.404.071) 10558
42/61 11:48 +2.02-- 1.Rxd5 exd5 (7.484.472.567) 10558
42/61 11:56 +1.99 1.Rxd5 exd5 2.Rd1 Qe8 3.Rxd5 Qg8
4.Bd6 Qg6 5.Qe2 Qb1+ 6.Rd1 Qg6 7.Be4 Qg8
8.Bxa8 Rxa8 9.Qxb5 Bc3 10.Qxc5 Bxf6
11.Be5 Bxe5 12.Qxe5+ Qg7 13.Qe4 Rf8
14.Rd5 (7.569.133.767) 10557
43/70 12:26 +2.07++ 1.Rxd5 (7.882.650.195) 10562
43/70 13:11 +2.14++ 1.Rxd5 (8.364.566.290) 10561
43/70 13:40 +1.92-- 1.Rxd5 exd5 (8.669.848.401) 10569
43/70 13:47 +2.08++ 1.Rxd5 (8.749.106.421) 10569
43/70 14:02 +2.04 1.Rxd5 exd5 2.Rd1 Qg8 3.Bxd5 Qg6
4.Bxa8 Rxa8 5.Qf3 Rg8 6.h4 c4 7.bxc4 bxc4
8.Rd7 h6 9.h5 Qb1+ 10.Kg2 Qh7 11.Rc7 Rd8
12.Qf4 c3 13.Qc4 Rf8 14.Bf4 (8.904.379.097) 10570
44/57 14:20 +2.11++ 1.Rxd5 (9.095.334.060) 10570
44/63 15:20 +2.17 1.Rxd5 exd5 2.Rd1 Qg8 3.Bxd5 Qg6
4.Bxa8 Rxa8 5.Qf3 Re8 6.h4 c4 7.bxc4 bxc4
8.Rd7 h6 9.h5 Qb1+ 10.Kg2 Qh7 11.Qd5 Rf8
12.Bf4 Kg8 13.Be3 c3 14.Rc7 (9.739.624.780) 10584
45/63 15:21 +2.17 1.Rxd5 exd5 2.Rd1 Qg8 3.Bxd5 Qg6
4.Bxa8 Rxa8 5.Qf3 Re8 6.h4 c4 7.bxc4 bxc4
8.Rd7 h6 9.h5 Qb1+ 10.Kg2 Qh7 11.Qd5 Rf8
12.Bf4 Kg8 13.Be3 c3 14.Rc7 (9.757.078.489) 10583
best move: Rd1xd5 time: 15:22.015 min n/s: 10.583.823 nodes: 9.757.078.489
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
-
Eelco de Groot
- Posts: 4561
- Joined: Sun Mar 12, 2006 2:40 am
- Full name:
Re: Old position I posted a while back
Last post about this testposition: Test Position: Rxd5!! still to tough for my engines/hardware Strange, I must have completely missed that thread. More than 50 replies!
-
Lyudmil Tsvetkov
- Posts: 6052
- Joined: Tue Jun 12, 2012 12:41 pm
Re: Old position I posted a while back
sorry Eelco,Eelco de Groot wrote:Thanks Andrew, this does not seem very difficult for almost default Stockfish development version:
r2r1q1k/5p1p/4pP2/pppbB2Q/1b6/1P4P1/5PBP/R2R2K1 w - -
Engine: Test Imbalance HT (i7 6700, 4+3 threads, 512 MB)
Latest changes: Very small change to passed pawns and SkipEarlyPruning only. I forgot. To quote Wasily Smyslow (Vasily Smyslov?) when playing an elementary Rook endgame against the Fidelity Elite: I wrrote a book about this. But I forgot what I wrrote!
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
24/47 0:02 +0.90 1.Bf4 Qg8 2.Bxd5 exd5 3.Rxd5 Rxd5
4.Qxd5 Rd8 5.Qf3 Qg6 6.Bc7 Qd3 7.Qh5 Rg8
8.Qxf7 Bc3 9.Rc1 Bd4 10.Qh5 Qg6
11.Qxg6 Rxg6 12.Bd6 Bxf6 13.Bxc5 Rg8
14.Kg2 (30.477.247) 10904
.
.
.
31/55 0:22 +0.62 1.Bxd5 exd5 2.Bc7 Rd7 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Ra2 Qg6 9.Re2 c3
10.Kg2 h6 11.Re4 c2 12.Rc4 Kh7
13.Qe2 Qd3 14.Qxc2 (246.687.289) 10861
32/53 0:26 +0.69 1.Bxd5 exd5 2.Bc7 Rd7 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Ra2 Qg6 9.Re2 c3
10.Kg2 h6 11.Bc7 Rf8 12.Qc6 Kh7
13.Be5 Qg4 14.Re4 (282.714.381) 10856
33/48 0:30 +0.61-- 1.Bxd5 exd5 (330.951.870) 10781
33/48 0:35 +0.65 1.Bxd5 exd5 2.Bc7 Rd7 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Ra2 Qg6 9.Re2 c3
10.Kg2 h6 11.Re4 c2 12.Rc4 Kh7
13.Qe2 Qd3 14.Qxc2 (378.209.458) 10732
34/52 0:43 +0.58 1.Bc7 Rd7 2.Bxd5 exd5 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Ra2 Qg6 9.Re2 c3
10.Re4 c2 11.Rc4 h6 12.Qe2 Kh7
13.Kg2 Qd3 14.Qxc2 (465.456.787) 10635
35/54 0:48 +0.66++ 1.Bc7 (513.351.844) 10629
35/62 0:52 +0.64 1.Bc7 Rd7 2.Bxd5 exd5 3.Bf4 Qg8
4.Rxd5 Rxd5 5.Qxd5 Rd8 6.Qf3 c4
7.bxc4 bxc4 8.Kg2 Qe8 9.Ra2 Qd7
10.Re2 Bf8 11.Rd2 Qc8 12.Rxd8 Qxd8
13.Qc6 Kg8 14.Qxc4 (559.163.953) 10604
36/49 1:12 +0.71++ 1.Bc7 (766.533.756) 10613
36/59 1:27 +0.67 1.Bc7 Rd7 2.Be4 Qg8 3.Bxd5 Rxd5
4.Rxd5 exd5 5.Qxd5 a4 6.bxa4 bxa4
7.Bd6 Bc3 8.Ra2 Bxf6 9.Bxc5 Bg7
10.Qd7 Qc8 11.Qxc8+ Rxc8 12.Rxa4 Rxc5
13.Ra8+ Bf8 14.Rxf8+ (931.513.201) 10616
37/57 1:44 +0.69 1.Bc7 Rd7 2.Be4 Qg8 3.Bxd5 Rxd5
4.Rxd5 exd5 5.Qxd5 a4 6.bxa4 bxa4
7.Bd6 Bc3 8.Ra2 Bxf6 9.Bxc5 Bg7
10.Qd7 Qc8 11.Qxc8+ Rxc8 12.Rxa4 Rxc5
13.Ra8+ Bf8 14.Rxf8+ (1.113.773.689) 10609
38/57 2:42 +0.77++ 1.Rxd5 (1.706.663.978) 10498
38/57 2:52 +0.84++ 1.Rxd5 (1.804.017.585) 10470
38/57 3:07 +0.95++ 1.Rxd5 (1.956.943.623) 10446
38/62 3:41 +1.11++ 1.Rxd5 (2.312.737.029) 10446
38/62 4:10 +1.33++ 1.Rxd5 (2.614.845.922) 10433
38/62 4:52 +1.08 1.Rxd5 exd5 2.Rd1 a4 3.bxa4 bxa4
4.Bxd5 Qe8 5.Bxa8 Rxa8 6.Qg4 Qg8
7.Qc4 Re8 8.Bf4 Qg6 9.Qb5 Rg8
10.Qxa4 Bc3 11.Be3 Bxf6 12.Rd5 Qg4
13.Qxg4 Rxg4 14.Rxc5 (3.053.911.842) 10429
39/26 5:06 +1.16++ 1.Rxd5 (3.199.844.908) 10444
39/26 5:09 +1.23++ 1.Rxd5 (3.232.620.780) 10445
39/41 5:14 +1.35++ 1.Rxd5 (3.283.955.188) 10448
39/49 5:18 +1.50++ 1.Rxd5 (3.333.442.989) 10452
39/49 6:00 +1.72++ 1.Rxd5 (3.784.224.226) 10490
39/63 7:32 +2.01++ 1.Rxd5 (4.759.114.358) 10517
39/64 7:54 +1.92 1.Rxd5 exd5 2.Rd1 Qe8 3.Rxd5 Qg8
4.Bd6 Qg6 5.Qe2 Qb1+ 6.Rd1 Qg6 7.Be4 Qg8
8.Rd5 Bc3 9.Qe3 Bxf6 10.Qf4 Bg7
11.Rh5 Rxd6 12.Qxd6 Qf8 13.Qd7 Ra6
14.Qxb5 (4.987.891.671) 10520
40/64 8:23 +2.00++ 1.Rxd5 (5.294.279.220) 10521
40/64 9:23 +2.07++ 1.Rxd5 (5.923.399.976) 10514
40/83 10:27 +2.07 1.Rxd5 exd5 2.Rd1 Qg8 3.Bxd5 Rd7
4.Bxa8 Rxd1+ 5.Qxd1 Qxa8 6.Qd7 Qg8
7.Qxb5 h6 8.Qc4 Qg6 9.Kg2 Kg8 10.Qf4 Qg5
11.Qe4 Qg6 12.Qa8+ Kh7 13.Qf3 Kg8
14.h4 (6.610.482.139) 10536
41/68 10:56 +2.00-- 1.Rxd5 exd5 (6.919.176.129) 10541
41/68 11:03 +2.07++ 1.Rxd5 (6.997.083.014) 10543
41/68 11:44 +2.17 1.Rxd5 exd5 2.Rd1 Qe8 3.Rxd5 Qg8
4.Bd6 Qg6 5.Qe2 Qb1+ 6.Rd1 Qg6 7.Be4 Qg8
8.Bxa8 Rxa8 9.Qxb5 Bc3 10.Qxc5 Bxf6
11.Be5 Bxe5 12.Qxe5+ Qg7 13.Qe4 Rf8
14.Rd5 (7.433.086.588) 10557
42/61 11:46 +2.10-- 1.Rxd5 exd5 (7.458.404.071) 10558
42/61 11:48 +2.02-- 1.Rxd5 exd5 (7.484.472.567) 10558
42/61 11:56 +1.99 1.Rxd5 exd5 2.Rd1 Qe8 3.Rxd5 Qg8
4.Bd6 Qg6 5.Qe2 Qb1+ 6.Rd1 Qg6 7.Be4 Qg8
8.Bxa8 Rxa8 9.Qxb5 Bc3 10.Qxc5 Bxf6
11.Be5 Bxe5 12.Qxe5+ Qg7 13.Qe4 Rf8
14.Rd5 (7.569.133.767) 10557
43/70 12:26 +2.07++ 1.Rxd5 (7.882.650.195) 10562
43/70 13:11 +2.14++ 1.Rxd5 (8.364.566.290) 10561
43/70 13:40 +1.92-- 1.Rxd5 exd5 (8.669.848.401) 10569
43/70 13:47 +2.08++ 1.Rxd5 (8.749.106.421) 10569
43/70 14:02 +2.04 1.Rxd5 exd5 2.Rd1 Qg8 3.Bxd5 Qg6
4.Bxa8 Rxa8 5.Qf3 Rg8 6.h4 c4 7.bxc4 bxc4
8.Rd7 h6 9.h5 Qb1+ 10.Kg2 Qh7 11.Rc7 Rd8
12.Qf4 c3 13.Qc4 Rf8 14.Bf4 (8.904.379.097) 10570
44/57 14:20 +2.11++ 1.Rxd5 (9.095.334.060) 10570
44/63 15:20 +2.17 1.Rxd5 exd5 2.Rd1 Qg8 3.Bxd5 Qg6
4.Bxa8 Rxa8 5.Qf3 Re8 6.h4 c4 7.bxc4 bxc4
8.Rd7 h6 9.h5 Qb1+ 10.Kg2 Qh7 11.Qd5 Rf8
12.Bf4 Kg8 13.Be3 c3 14.Rc7 (9.739.624.780) 10584
45/63 15:21 +2.17 1.Rxd5 exd5 2.Rd1 Qg8 3.Bxd5 Qg6
4.Bxa8 Rxa8 5.Qf3 Re8 6.h4 c4 7.bxc4 bxc4
8.Rd7 h6 9.h5 Qb1+ 10.Kg2 Qh7 11.Qd5 Rf8
12.Bf4 Kg8 13.Be3 c3 14.Rc7 (9.757.078.489) 10583
best move: Rd1xd5 time: 15:22.015 min n/s: 10.583.823 nodes: 9.757.078.489
I am doing many things at the same time/analysing many positions simultaneously, so probably I am doing everything wrong,
but where is white win after d4:
[d]r2r1q1k/5p1p/5P2/ppp1B2Q/1b1p4/1P4P1/5PBP/3R2K1 w - - 0 3
my SF does not see it.
-
Lyudmil Tsvetkov
- Posts: 6052
- Joined: Tue Jun 12, 2012 12:41 pm
Re: Old position I posted a while back
ok, it sees high scores after white's g4, followed by Rd3 to swing to h3, have to feed it manually to SF, seems to be too deep for it, but is it won?
in one of the lines I get here:
[d]8/3R1pkp/5b2/5K2/5P2/8/7P/8 w - - 0 29
anyone with 8-men?
in one of the lines I get here:
[d]8/3R1pkp/5b2/5K2/5P2/8/7P/8 w - - 0 29
anyone with 8-men?
-
Eelco de Groot
- Posts: 4561
- Joined: Sun Mar 12, 2006 2:40 am
- Full name:
Re: Old position I posted a while back
Hi Lyudmil,
Well, it's possible I broke Stockfish, but on the other hand the idea from Stockfish seems okay; d4 makes possible to play Be4 with an immediate mate threat on h7. Qg8 is forced but now both king and queen are locked in their castle, White plays g4 and then lifts the rook to d3 then h3.
Well, it's possible I broke Stockfish, but on the other hand the idea from Stockfish seems okay; d4 makes possible to play Be4 with an immediate mate threat on h7. Qg8 is forced but now both king and queen are locked in their castle, White plays g4 and then lifts the rook to d3 then h3.
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
-
Lyudmil Tsvetkov
- Posts: 6052
- Joined: Tue Jun 12, 2012 12:41 pm
Re: Old position I posted a while back
ok, here is the fully forced line: Rd5!!(??) ed5 Rd1 d4 Be4 Qg8 g4 Re8 Rd3 c4 Rh3 Re5 Qe5 Re8 Qf4 Re4 Qe4 c3:Lyudmil Tsvetkov wrote:ok, it sees high scores after white's g4, followed by Rd3 to swing to h3, have to feed it manually to SF, seems to be too deep for it, but is it won?
in one of the lines I get here:
[d]8/3R1pkp/5b2/5K2/5P2/8/7P/8 w - - 0 29
anyone with 8-men?
[d]6qk/5p1p/5P2/pp6/1b1pQ1P1/1Pp4R/5P1P/6K1 w - - 0 10
is this necessarily won for white?
I get to mostly some possible fortresses.
-
Lyudmil Tsvetkov
- Posts: 6052
- Joined: Tue Jun 12, 2012 12:41 pm
Re: Old position I posted a while back
with the end result a possible fortress...?Eelco de Groot wrote:Hi Lyudmil,
Well, it's possible I broke Stockfish, but on the other hand the idea from Stockfish seems okay; d4 makes possible to play Be4 with an immediate mate threat on h7. Qg8 is forced but now both king and queen are locked in their castle, White plays g4 and then lifts the rook to d3 then h3.
I know why people hate me, I ask too many questions and analyse too little.
-
Eelco de Groot
- Posts: 4561
- Joined: Sun Mar 12, 2006 2:40 am
- Full name:
Re: Old position I posted a while back
"My" Stockfish sees that in 8 seconds, on a few spare threadsLyudmil Tsvetkov wrote:ok, it sees high scores after white's g4, followed by Rd3 to swing to h3, have to feed it manually to SF, seems to be too deep for it
It's won if you can show that White is winning here:, but is it won?
[D]8/5p1k/5Pqp/p1pQ4/1b5P/1P4P1/1B3PK1/8 w - -
But it could be drawn, score does not change anymore and neither does the PV
in one of the lines I get here:
[d]8/3R1pkp/5b2/5K2/5P2/8/7P/8 w - - 0 29
anyone with 8-men?
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan